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US3023498A - Parachute harness strap cutter - Google Patents

Parachute harness strap cutter Download PDF

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Publication number
US3023498A
US3023498A US44994A US4499460A US3023498A US 3023498 A US3023498 A US 3023498A US 44994 A US44994 A US 44994A US 4499460 A US4499460 A US 4499460A US 3023498 A US3023498 A US 3023498A
Authority
US
United States
Prior art keywords
slot
chamber
frame
stop
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US44994A
Other languages
English (en)
Inventor
Temple Robert
Ernest E Temple
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MSA Safety Inc
Original Assignee
Mine Safety Appliances Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mine Safety Appliances Co filed Critical Mine Safety Appliances Co
Priority to US44994A priority Critical patent/US3023498A/en
Priority to BE606466A priority patent/BE606466A/fr
Priority to GB26763/61A priority patent/GB911858A/en
Application granted granted Critical
Publication of US3023498A publication Critical patent/US3023498A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D17/00—Parachutes
    • B64D17/22—Load suspension
    • B64D17/38—Releasable fastening devices between parachute and load or pack
    • B64D17/386—Devices adapted to cut lines or straps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves
    • B23D15/12—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor
    • B23D15/14—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor actuated by fluid or gas pressure
    • B23D15/145—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor actuated by fluid or gas pressure actuated by explosion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S30/00—Cutlery
    • Y10S30/04—Explosive

Definitions

  • a ⁇ frame has a slot through it for lreceiving a parachute harness strap.
  • One wall of the slot is provided with a recess that receives a cutting blade which extends across one side of the slot.
  • the frame is also provided with a chamber behind the recess and having an open end communicating with the recess. Inside the recess there is a piston for ⁇ driving the Ablade across the slot and against its opposite wall.
  • the rame also is provided with a cartridge chamber and with a passage connecting that chamber with the piston cham- -ber at the inner end o-f the piston.
  • Slidably mounted in the frame behind the cartridge chamber is a tiring pin that can be driven ahead toward the cartridge chamber by springactuated means located behind it. Such means normally is maintained in retracted position by manually removable means which, when removed, will permit the spring-actuated means to drive the tiring pin.
  • FIG. l is a perspective view of our cutter mounted on a pair of straps
  • FIG. 2 is a longitudinal section parallel to the straps
  • FIG. 3 is a longitudinal section taken on the line III-III of FIG. 2;
  • FIG. 4 is a transverse section taken on the line IV-IV of FIG. 2;
  • FIG. 5 is a view similar to FIG. 3, but showing the device after it has been tired;
  • FIG. 6 is a view of one side of a modification of this invention.
  • FIG. 7 is a longitudinal section taken on the line VII-VII of FIG. 6;
  • FIG. 8 is a transverse section taken on the line VIII-VII of FG. 6;
  • FIGS. 9 and l0 are sectional views similar to FIGS. 7 and 8, respectively, but showing the cutter after it has been tired.
  • a frame is formed from a metal block 1 and a metal base 2. At opposite ends of the block there are laterally spaced integral lugs 3 that project downward between upwardly projecting lugs 4 at the ends of the base. Each group of lugs is provided with a passage, in one of which a hinge pin 5 is permanently mounted and in the other of which there is a removable screw 6 that is threaded at one end.
  • the space between the central portion of the base and the bottom of the block forms a rectangular slot 7, through which the webbing forming one or more harness straps 8 3,023,498 Patented Mar. 6, 1962 rice can extend. Straps are inserted in the slot by i-rst removing screw 6 so that one end of the base can be swung away from the block to open one side of the slot for reception of the straps.
  • the block 1 is provided with a recess ltl that extends more than the width of the slot.
  • a cutting -blade 11 is disposed in this recess with its cutting edge facing base 2.
  • the blade is a little longer than the width of the slot, which is possible because the two lugs beneath the blade are provided With notches 12 that can receive the ends of the blade.
  • the central portion of the blade is secured to the bottom of a piston 13 that extends up into a chamber 14 in the frame block. Ordinarily the piston and blade are held in their upper or retracted position by a shear pin 15 (FI-G. 4) projecting inwardly from one'side of recess 1) and engaging the front of the piston.
  • the back or upper part of the piston is provided with a peripheral groove in which a sealing gasket 16 is disposed for engagement with the encircling side wall of the chamber.
  • the back part of the piston chamber is connected by a transverse passage 18 with one end of a cartridge chamber 19 that extends lengthwise of the blade beside the piston, as shown in FIG. 2.
  • a cartridge chamber 19 that extends lengthwise of the blade beside the piston, as shown in FIG. 2.
  • the sleeve contains an explosive cartridge 23, and behind the sleeve there is another chamber 24 connected lwith it by a small central passage 25.
  • the passage is large enough to receive a firing pin 26 mounted on the front end of a cuplike member 2.7 Slidably mounted in chamber 24.
  • a coil spring 23 that presses against a screw plug 29 in the outer end of chamber 24.
  • the spring and cup which constitute spring-actuated means for driving the firing pin, normally are held in retracted posi-tion with the spring compressed by means of the inner end of a stop 31 (FIG. 3) Slidably mounted in an opening 32 drilled in the frame block perpendicular to the front portion of tiring pin chamber 24.
  • the central part of the stop may be provided with a peripheral groove for receiving a sealing gasket 33 that also helps hold the stop in position.
  • the inner end of the stop is notched to fit over the front end of the firing pin cup and thereby hold the pin back away from the cartridge.
  • a flexible line or lanyard 34 Secured to the outer end of the stop is a flexible line or lanyard 34, the
  • the lanyard normally extends through -a groove 36 in the top of the frame, and the ball is dis'- posed in a recess 37 formed in one corner of the frame.
  • the lanyard and ball are held in those positions by a channel-shape cover 38 that rits ⁇ over the frame block and has inturned longitudinal edges that lit in shallow grooves 39 in the opposite sides of the block.
  • the parachutist cari insert a finger in the recess 37, or in a similar one 40 at the opposite end of the frame, and easily pull the cover off the frame. All he has to do then is to pull on ball 35 to remove stop 31 from in front of the ring pin cup, as shown in FIG. 5, whereupon coil spring 2S will expand and drive the pin 26 forward against the cartridge to re it. The expanding ygases from the cartridge will drive the piston and blade toward the base of the frame and thereby cut the harness straps that are in the slot 7 to release the parachute from the man. All of this can be done very quickly and easily.
  • the upper end of the piston chamber is connected by a short channel 56a and passage 56 with the front end of a cartridge chamber 57, In line with this chamber at the opposite end of the block is another chamber S3, which slidably receives a hammer 59 that is urged forward by coil springs 60.
  • the cartridge and hammer chambers are connected by a cylindrical chamber 61 that has its axis at right angles to the first two chambers and also has an open end at the side of the block farthest from the base.
  • a cup-like breechblock 62 that engages the rear end of the cartridge.
  • the breechblock has a pair of diametrically spaced holes 63 and 64 concentric with chambers 57 and 58, respectively.
  • the hammer projects through the second hole and into engagement with the side of a hollow stop 65 journaled in the breechblock. The hammer holds the stop in place by projecting into a peripheral groove 66 around the stop.
  • the outer end of the stop overlies the breechblock, and a sealing ring 67 (FIG. 8) is disposed between them.
  • the stop is provided with a pair of diametrically opposite holes 68, large enough to receive the hammer, which normally are held about half way between the breechblock holes by means of a flattened area of the breechblock bearing against the hammer.
  • Fitting inside of the rotatable stop is a plug 70, the inner end of which is rigidly connected to the breechblock.
  • the plug has a radial passage 71 through it in line with the breechblock holes, but normally closed by the encircling stop.
  • a firing pin 72 is slidably mounted in the plug passage.
  • a knob 74 rigidly mounted on the outer end of stop 65 is turned by the parachutist until the radial holes in the stop line up with passage 71 and the breechblock holes. At that instant the hammer springs forward and strikes the back of the tiring pin to drive its front end out of the stop, through breechblock hole 63 and against the cartridge to detonate it, as shown in FIG. 9. Then, as shown in FIG. 10, the expanding gases drive the piston and blade across slot 47 to cut the harness webbing therein and release the parachute.
  • This cutter as well as the rst one described, can be attached to the clothing of the parachutist if desired by a cord 75 secured at one end to the cutter frame, as shown in FIG. 6.
  • a parachute harness strap cutter comprising a frame having a body and base with a strap-receiving slot between them extending through the frame and being closed at four sides, the body and base being detachably connected together beside said slot to permit the slot to be opened to -admit a parachute harness strap, said body provided with a recess in one wall of the slot extending across the slot, a cutting blade disposed in said recess, the frame body being provided with a chamber behind and opening into said recess, a piston in said recess for driving said blade across the slot and against said base, the frame body also being provided with a cartridge chamber and a passage connecting it with said piston chamber at the inner end of the piston, a firing pin slidably mounted in the frame body behind said cartridge chamber, spring-actuated means for driving said pin ahead toward the cartridge chamber, and means normally maintaining the spring-actuated means retracted but manually movable to permit the latter to drive the firing pin.
  • a strap cutter according to claim 1 in which said body and base are hinged together at one side of said slot, and including manually removable means connecting said -body and base together at the opposite side of the slot to permit the slot to be opened.
  • a parachute harness strap cutter comprising a frame having a body and base with a strap-receiving slot between them extending through the frame and being closed at four sides, the frame and body being detachably connected together beside said slot to permit the slot to be opened to admit a parachute harness strap, said body being provided with a recess in one wall of the slot extending across the slot, a cutting blade disposed in said recess, the frame body being provided with a chamber behind and opening into said recess, a piston in said recess for driving said blade across the slot and against said base, the frame body also being provided with a cartridge chamber and a passage connecting it with said piston chamber at the inner end of the piston, a 'firing pin slidably mounted in the frame body behind said cartridge chamber, spring-actuated means for driving said pin ahead toward the cartridge chamber, a rotatable stop surrounding said pin and journaled in the frame on an axis perpendicular to the axis of the pin, said stop being provided with a pair of
  • a parachute harness strap cutter comprising a frame having a body and base with a strap-receiving slot between them extending through the frame and being closed at four sides, the frame and body being detachably connected together beside said slot to permit the slot to be opened to admit a parachute harness strap, said body being provided with a recess in one wall of the slot extending across the slot, a cutting blade disposed in said recess, the frame body being provided with a chamber behind and opening in to said recess, a piston in said recess for driving said blade across the slot and against said base, the frame body also being provided with a cartridge chamber and a passage connecting it with said piston chamber at theinner end of the piston, a firing pin slidably mounted in the frame body behind said cartridge chamber, spring-actuated means for driving said pin ahead toward the cartridge chamber, a hollow breechblock removably mounted in the frame behind said cartridge chamber and provided with a pair of openings therethrough in line with that chamber, one of said openings receiving the front end
  • a strap cutter according to claim 4 in which said stop is provided with a peripheral groove normally receiving the front end of said spring-actuated means.
  • a parachute harness strap cutter comprising a frame having a strap-receiving slot therethrough and a recess in,
  • a stop slidably 10 mounted in the frame and holding said means retracted, flexible means for pulling the stop laterally away from said spring-actuated means to permit the latter to drive the ring pin ahead, and ⁇ a manually removable cover frictionally engaging the frame and covering said exible means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Scissors And Nippers (AREA)
  • Emergency Lowering Means (AREA)
US44994A 1960-07-25 1960-07-25 Parachute harness strap cutter Expired - Lifetime US3023498A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US44994A US3023498A (en) 1960-07-25 1960-07-25 Parachute harness strap cutter
BE606466A BE606466A (fr) 1960-07-25 1961-07-24 Dispositif sectionneur de courroie de parachute à l'aterrissage ou autres applications
GB26763/61A GB911858A (en) 1960-07-25 1961-07-24 Parachute harness strap cutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US44994A US3023498A (en) 1960-07-25 1960-07-25 Parachute harness strap cutter

Publications (1)

Publication Number Publication Date
US3023498A true US3023498A (en) 1962-03-06

Family

ID=21935434

Family Applications (1)

Application Number Title Priority Date Filing Date
US44994A Expired - Lifetime US3023498A (en) 1960-07-25 1960-07-25 Parachute harness strap cutter

Country Status (3)

Country Link
US (1) US3023498A (fr)
BE (1) BE606466A (fr)
GB (1) GB911858A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353267A (en) * 1965-10-20 1967-11-21 Mine Safety Appliances Co Explosively actuated cablecutting tool
US3632066A (en) * 1970-06-16 1972-01-04 Sauna International Inc Automatic parachute harness release assembly
US4174015A (en) * 1977-03-07 1979-11-13 Michel Farcinade Restraint severing device
US4858856A (en) * 1987-03-06 1989-08-22 Helmut Cloth Pressure dependent release device for a parachute
US5816535A (en) * 1996-04-10 1998-10-06 Lockheed Martin Corporation Emergency cargo extraction parachute jettison system
US20050067533A1 (en) * 2002-05-14 2005-03-31 Jan Lukavec Automatic releasing device for a parachute
US7306188B1 (en) * 2003-11-18 2007-12-11 Heflin Mark N Non-pyrotechnic remote-controlled parachute jettison device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114194419B (zh) * 2021-11-29 2023-07-14 北京空间机电研究所 一种适用于运载火箭整流罩回收的降落伞系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1397911A (en) * 1918-11-30 1921-11-22 Tossizza Constantin Apparatus for severing cables
US2687572A (en) * 1951-05-07 1954-08-31 Detroit Edison Co Pole-insulated wire cutter
US2716813A (en) * 1953-08-25 1955-09-06 Lynn E Smyres Explosively actuated cutting tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1397911A (en) * 1918-11-30 1921-11-22 Tossizza Constantin Apparatus for severing cables
US2687572A (en) * 1951-05-07 1954-08-31 Detroit Edison Co Pole-insulated wire cutter
US2716813A (en) * 1953-08-25 1955-09-06 Lynn E Smyres Explosively actuated cutting tool

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353267A (en) * 1965-10-20 1967-11-21 Mine Safety Appliances Co Explosively actuated cablecutting tool
US3632066A (en) * 1970-06-16 1972-01-04 Sauna International Inc Automatic parachute harness release assembly
US4174015A (en) * 1977-03-07 1979-11-13 Michel Farcinade Restraint severing device
US4858856A (en) * 1987-03-06 1989-08-22 Helmut Cloth Pressure dependent release device for a parachute
US5024400A (en) * 1987-03-06 1991-06-18 Helmut Cloth Releasing device for a parachute
US5816535A (en) * 1996-04-10 1998-10-06 Lockheed Martin Corporation Emergency cargo extraction parachute jettison system
US20050067533A1 (en) * 2002-05-14 2005-03-31 Jan Lukavec Automatic releasing device for a parachute
US6953173B2 (en) 2002-05-14 2005-10-11 Jan Lukavec Automatic releasing device for a parachute
US7306188B1 (en) * 2003-11-18 2007-12-11 Heflin Mark N Non-pyrotechnic remote-controlled parachute jettison device

Also Published As

Publication number Publication date
BE606466A (fr) 1961-11-16
GB911858A (en) 1962-11-28

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